1/*
2 * Copyright (c) 2001-2005 The Regents of The University of Michigan
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are
7 * met: redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer;
9 * redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution;
12 * neither the name of the copyright holders nor the names of its
13 * contributors may be used to endorse or promote products derived from
14 * this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
19 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
20 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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30 */
31
32#ifndef __ALPHA_MEMORY_HH__
33#define __ALPHA_MEMORY_HH__
34
35#include <map>
36
37#include "arch/alpha/ev5.hh"
38#include "arch/alpha/isa_traits.hh"
39#include "arch/alpha/faults.hh"
40#include "base/statistics.hh"
41#include "mem/request.hh"
42#include "sim/sim_object.hh"
43
44class ExecContext;
45
46class AlphaTLB : public SimObject
47{
48 protected:
49 typedef std::multimap<Addr, int> PageTable;
50 PageTable lookupTable; // Quick lookup into page table
51
52 AlphaISA::PTE *table; // the Page Table
53 int size; // TLB Size
54 int nlu; // not last used entry (for replacement)
55
56 void nextnlu() { if (++nlu >= size) nlu = 0; }
57 AlphaISA::PTE *lookup(Addr vpn, uint8_t asn) const;
58
59 public:
60 AlphaTLB(const std::string &name, int size);
61 virtual ~AlphaTLB();
62
63 int getsize() const { return size; }
64
65 AlphaISA::PTE &index(bool advance = true);
66 void insert(Addr vaddr, AlphaISA::PTE &pte);
67
68 void flushAll();
69 void flushProcesses();
70 void flushAddr(Addr addr, uint8_t asn);
71
72 // static helper functions... really EV5 VM traits
73 static bool validVirtualAddress(Addr vaddr) {
74 // unimplemented bits must be all 0 or all 1
75 Addr unimplBits = vaddr & EV5::VAddrUnImplMask;
76 return (unimplBits == 0) || (unimplBits == EV5::VAddrUnImplMask);
77 }
78
79 static Fault checkCacheability(RequestPtr &req);
80
81 // Checkpointing
82 virtual void serialize(std::ostream &os);
83 virtual void unserialize(Checkpoint *cp, const std::string §ion);
84};
85
86class AlphaITB : public AlphaTLB
87{
88 protected:
89 mutable Stats::Scalar<> hits;
90 mutable Stats::Scalar<> misses;
91 mutable Stats::Scalar<> acv;
92 mutable Stats::Formula accesses;
93
94 public:
95 AlphaITB(const std::string &name, int size);
96 virtual void regStats();
97
98 Fault translate(RequestPtr &req, ExecContext *xc) const;
99};
100
101class AlphaDTB : public AlphaTLB
102{
103 protected:
104 mutable Stats::Scalar<> read_hits;
105 mutable Stats::Scalar<> read_misses;
106 mutable Stats::Scalar<> read_acv;
107 mutable Stats::Scalar<> read_accesses;
108 mutable Stats::Scalar<> write_hits;
109 mutable Stats::Scalar<> write_misses;
110 mutable Stats::Scalar<> write_acv;
111 mutable Stats::Scalar<> write_accesses;
112 Stats::Formula hits;
113 Stats::Formula misses;
114 Stats::Formula acv;
115 Stats::Formula accesses;
116
117 public:
118 AlphaDTB(const std::string &name, int size);
119 virtual void regStats();
120
121 Fault translate(RequestPtr &req, ExecContext *xc, bool write) const;
122};
123
124#endif // __ALPHA_MEMORY_HH__
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